题目内容

4
5
+
3
5
-1
11
17
+
3
17
+
2
17
7
15
+
4
15
-
2
15
5
18
-
1
18
+
14
18
1-
1
9
-
2
9
25
27
+
5
27
-
8
27
(1)
4
5
+
3
5
-
1,
=
4+3-5
5

=
2
5


(2)
11
17
+
3
17
+
2
17

=
11+3+2
17

=
16
17


(3)
7
15
+
4
15
-
2
15

=
7+4-2
15

=
9
15

=
3
5


(4)
5
18
-
1
18
+
14
18

=
5-1+14
18

=
18
18

=1;
(5)1-
1
9
-
2
9

=
9-1-2
9

=
6
9

=
2
3


(6)
25
27
+
5
27
-
8
27

=
25+5-8
27

=
22
27
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